Arena

$ARGUMENTS

Run competitions between programs and evolve winning strategies, following Stephen Wolfram's "Games Between Programs: The Ruliology of Competition". Parse $ARGUMENTS to pick a subcommand. Each subcommand maps to an MCP tool exported by this plugin (arena/run, tournament/run, evolve/run, coevolve/run, run/get, run/list).

Subcommands

arena run --a <strategy> --b <strategy> [--game pd] [--rounds 200] [--seed 1] Run one deterministic match. Strategies come from the classic roster (tit-for-tat, always-cooperate, always-defect, grim, pavlov, alternate, random, …).

1. Call MCP tool arena/run with the parsed args.
2. Report cumulative + mean payoffs.

arena tournament [--game pd] [--rounds 200] [--seed 1] Round-robin over the classic roster → Wolfram's competitive array (mean-payoff matrix) + mean-vs-field ranking.

1. Call tournament/run.
2. Display result.tables.competitiveArray and result.tables.ranking.

arena evolve [--game pd] [--generations 300] [--seed 42] Hill-climb an FSM strategy against the field (mutate → keep-if-fitter). Shows the plateau→breakthrough fitness curve.

1. Call evolve/run; display result.sparkline, finalFitness, and the evolved program.

arena coevolve [--game pd] [--generations 400] [--seed 7] Mutual co-evolution (arms race) between two evolving strategies.

1. Call coevolve/run; display the payoff trace and range.

arena runs [--limit 20] / arena get <runId> List or fetch persisted run records.

Persistence (AgentDB)

The MCP tools persist full artifacts to .ruflo/arena/<runId>.json (exact replay). Each tool result also includes an agentdb payload — use it to store a searchable summary in AgentDB so runs are queryable later (the local stand-in for the RuVector data layer, ADR-196/197):

mcp__claude-flow__memory_store({
  namespace: result.agentdb.namespace,   // "arena"
  key:       result.agentdb.key,         // the runId
  value:     result.agentdb.value,       // JSON summary (kind, game, seed, ranking/fitness …)
  tags:      result.agentdb.tags         // ["ruliology","competition", kind, game]
})

Later: mcp__claude-flow__memory_search({ namespace: "arena", query: "tournaments where grim dominated" }).

Notes

• Everything is reproducible under --seed. Non-halting programs are out of scope in v1 (FSMs always halt); untrusted/evolved-program sandboxing is tracked in ADR-153.
• See docs/adrs/0001-arena-contract.md for the tool/data contract and ../../INTEGRATION-ADRS.md (in the ruliad meta-repo) for the full ADR map.